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概述了制备磷酸镁水泥所使用的原料和水泥的制备方法。探讨了磷酸镁水泥的水化机理和缓凝机理,并对主要水化产物磷酸镁铵(MgNH_4PO_4·6H_2O)的晶体化学结构进行了分析。综述了磷酸镁水泥的研究进展和应用前景。指出:磷酸镁水泥基础性研究不够深入,特别是水化机理和水化产物等方面存在争议;在磷酸镁水泥中采用较多的化学原料时会造成成本偏高;磷酸镁水泥在水化反应过程中释放氨气会造成空气污染;中国对磷酸镁水泥的研究报道较少,应用领域也较有限。以上种种因素限制了磷酸镁水泥的规模化生产和应用。因此,在深入开展磷酸镁水泥基础理论研究的同时,仍需对其应用领域进行推广,特别是寻求廉价的矿物和岩石原料或工业废弃物作为替代原料(如菱镁矿替代轻质碳酸镁等镁盐)或填料,这是磷酸镁水泥大量规模化生产和应用的关键。
The preparation methods of raw materials and cement used in preparation of magnesium phosphate cement are summarized. The hydration mechanism and retarding mechanism of magnesium phosphate cement were discussed. The crystal chemical structure of the main hydration product ammonium magnesium phosphate (MgNH 4 PO 4 · 6H 2 O) was also analyzed. The research progress and application prospects of magnesium phosphate cement are summarized. It is pointed out that the basic research of magnesium phosphate cement is not deep enough, especially the hydration mechanism and hydration products. There is controversy in the use of more chemical raw materials in magnesium phosphate cement. The cost of magnesium phosphate cement in hydration reaction The release of ammonia during the process can cause air pollution. There are few reports on the study of magnesium phosphate cement in China, and the application fields are relatively limited. The above factors limit the scale of magnesium phosphate cement production and application. Therefore, in-depth study of the basic theory of magnesium phosphate cement at the same time, still need to promote its application areas, in particular the search for cheap minerals and rock or industrial waste as an alternative raw materials (such as magnesite instead of light magnesium carbonate, etc. Magnesium salt) or filler, which is the key mass production and application of magnesium phosphate cement.